Ключевые слова: abstract, backdrop, background, barrier, border, boundary, cage, cell, cells, close, closeup, construction, dark, fence, futuristic, geometric, grate, grid, grill, grille, hole, industrial, industry, iron, jail, lattice, mesh, metal, metallic, modern, net, netting, network, pattern, prison, protection, safety, security, shape, shiny, silver, solid, steel, structure, technology, texture, wallpaper, wire, wireframe,